package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Log4j2
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info("文件上传："+file);
        //获取文件名称的后缀jpg
        String originalFilename = file.getOriginalFilename();//adc.jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID随机生成文件名称
        String fileName = UUID.randomUUID().toString() + suffix;
        //判断文件夹是否存在
        File dir = new File(basePath);
        if (!dir.exists()) {
            //如果不存在则创建
            dir.mkdirs();
        }
        //将文件传到指定的位置
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流读取文件
            FileInputStream infile = new FileInputStream(new File(basePath + name));

            //输出流,通过输出流将文件写回浏览器
            ServletOutputStream outfile = response.getOutputStream();
            //指定文件格式
            response.setContentType("/image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = infile.read(bytes))!=-1){
                outfile.write(bytes,0,len);
                outfile.flush();
            }
            //关闭流
            outfile.close();
            infile.close();

        } catch (Exception e) {
            e.printStackTrace();
        }


    }

}
